Author: John Merlino
Date: 12:32:56 09/13/03
Go up one level in this thread
On September 13, 2003 at 15:26:01, Frank Phillips wrote: >On September 13, 2003 at 15:13:47, John Merlino wrote: > >> >> >>The problem is that implementation of choosing a move from EGDBs is flawed in >>these cases. In general, the engine chooses the move that will lead to the >>shortest mate (if playing the winning side) or the longest mate (if playing the >>losing side). >> >>It is possible that either of those choices may be wrong, in that either the >>winning side will choose a move that leads to Mate in 61 (for example) that will >>be caught by the 50-move rule when choosing the Mate in 63 move will not be >>caught by the 50-move rule. The same (opposite) is true for the losing side. >> >>I think there might be too many possibilities for Black in this case to easily >>prove that White has a forced mate that will avoid the 50-move rule. >> >>jm > >Yep... I can see that apparently equal losses (or wins) in N may not really be >equal because one involves a move that resets the 50 move counter, but the other >does not - and therefore leads to a draw. > >Still it would be nice to see Gazza playing the wrong end of one of these ;-) > >Frank Indeed. And at least it has already been shown that, if the engines involved are using the standard EGDB implementation (and which ones don't?), then White will win if it plays Kxf4. [Event ""] [Site ""] [Date "2003.9.13"] [Round ""] [White "Chessmaster"] [Black "Chessmaster"] [Result "1-0"] [Setup "1"] [FEN "8/4k3/8/8/4Kp1p/5N1N/8/8 w - - 0 1"] 1.Kxf4 Kd6 2.Ke3 Kc5 3.Ke4 Kc6 4.Nfg5 Kc5 5.Ke5 Kc6 6.Ne4 Kd7 7.Kd5 Ke7 8.Kc6 Ke6 9.Neg5+ Ke7 10.Kc7 Kf6 11.Kd6 Kf5 12.Kd5 Kf6 13.Ke4 Ke7 14.Ke5 Kd7 15.Kd5 Kc7 16.Nf7 Kb6 17.Nd6 Ka5 18.Kc5 Ka4 19.Ne4 Kb3 20.Kb5 Kb2 21.Kb4 Kb1 22.Kb3 Kc1 23.Kc3 Kd1 24.Kd3 Kc1 25.Nc5 Kb2 26.Kd2 Ka2 27.Kc2 Ka3 28.Kc3 Ka2 29.Nd7 Kb1 30.Ne5 Ka2 31.Nc4 Kb1 32.Kd2 Ka2 33.Kc2 Ka1 34.Kb3 Kb1 35.Nb2 Kc1 36.Kc3 Kb1 37.Nd3 Ka2 38.Kb4 Kb1 39.Kb3 Ka1 40.Ne5 Kb1 41.Nf3 Kc1 42.Kc3 Kd1 43.Nf4 h3 44.Nh2 Kc1 45.Nd5 Kd1 46.Ne3+ Kc1 47.Kc4 Kb2 48.Kb4 Ka1 49.Nc4 Ka2 50.Kc3 Kb1 51.Kd2 Ka1 52.Kc1 Ka2 53.Kc2 Ka1 54.Kb3 Kb1 55.Nd2+ Kc1 56.Kc3 Kd1 57.Nb3 Ke1 58.Kd4 Ke2 59.Ke4 Ke1 60.Ke3 Kd1 61.Kd3 Ke1 62.Nc1 Kd1 63.Ne2 Ke1 64.Nc3 Kf2 65.Kd2 Kg2 66.Ke3 Kg3 67.Ne2+ Kg2 68.Nd4 Kg3 69.Ndf3 Kg2 70.Nd2 Kg3 71.Ndf1+ Kh4 72.Kf4 Kh5 73.Kf5 Kh6 74.Kf6 Kh7 75.Ne3 Kh6 76.Neg4+ Kh7 77.Kf7 Kh8 78.Nh6 Kh7 79.Nf5 Kh8 80.Kg6 Kg8 81.Ng7 Kf8 82.Kf6 Kg8 83.Ne6 Kh7 84.Kg5 Kg8 85.Kg6 Kh8 86.Kf7 Kh7 87.Ng4 h2 88.Nf8+ Kh8 89.Nf6 h1=Q 90.Ng6# 1-0 jm
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